The ex-Arsenal, Millwall and Gillingham man has been unable to break into the first team on a regular basis at Bramall Lane. With so many strikers ahead of him in the pecking order and the side seemingly making a Premiership promotion push, Shaw has opted for a move away from S2 and after negotiating his release he chose a return for his second spell at Millmoor.
Millers boss Alan Knill told the official website: " It's a great signing for us and I'm sure he will do well. He should also help to bring out the best in others such as Will Hoskins."
He goes straight into the Millers squad for tomorrow's clash with Forest and the team at MillersMad wish him all the best.